CN117824164A - Throttle valve control method of low-temperature heat pump EVI water heater - Google Patents
Throttle valve control method of low-temperature heat pump EVI water heater Download PDFInfo
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- CN117824164A CN117824164A CN202311798592.1A CN202311798592A CN117824164A CN 117824164 A CN117824164 A CN 117824164A CN 202311798592 A CN202311798592 A CN 202311798592A CN 117824164 A CN117824164 A CN 117824164A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 10
- 230000001502 supplementing effect Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a throttle valve control method of a low-temperature heat pump EVI water heater, wherein after a unit is started, a throttle valve is opened according to an initial opening and maintains the duration t of the initial opening 1 And then controlling the throttle valve to adjust the suction superheat degree, and carrying out first correction and second correction on the delta T in the adjusting process. The invention adopts a target superheat degree control mode for the throttle valve, and then corrects the throttle valve by using the exhaust superheat degree, so that the problem of out-of-control adjustment of the throttle valve is avoided, the exhaust temperature is always kept within a reasonable range value, the unit can be ensured to stably operate at different water temperatures and different ring temperatures, and the operation life of the unit is prolonged.
Description
Technical Field
The invention relates to a throttle valve control method of a low-temperature heat pump EVI water heater.
Background
The temperature range of the use environment of most low-temperature heat pump water heaters in the current market is-25-45 ℃, the water heaters can stably operate in the ultra-wide ring temperature range, and the control of the exhaust temperature of the compressor is very important. If the exhaust temperature is much higher, the cooling effect of the enameled wire inside the compressor is poor, and the problem of burning out the motor of the compressor is easy to occur; if the exhaust temperature of the compressor is much lower, the accelerated loss of the lubricating oil in the compressor can be caused, so that the lubricating effect of the lubricating oil is poor, and the service life of a unit can be influenced by long-time operation.
The control of the throttle valve of the system is particularly important when the exhaust temperature of the compressor is required to be controlled within a reasonable range all the time, and most water heaters control the opening of the throttle valve according to a fixed target superheat degree for the sake of simplicity and convenience in control, but the simple mode is easy to cause control deviation or control runaway, so that the problems are caused.
Disclosure of Invention
The invention provides a throttle valve control method of a low-temperature heat pump EVI water heater, which aims at solving the problems pointed out in the background technology.
The technical scheme adopted by the invention is as follows:
according to the throttle valve control method of the low-temperature heat pump EVI water heater, after a unit is started, a throttle valve is opened according to an initial opening degree and maintains the duration t of the initial opening degree 1 Then controlling a throttle valve to adjust the superheat degree of the air suction;
the suction superheat degree is adjusted as follows: opening change amount= delta T "- [ delta ] T, and rounding the calculation result, wherein when the calculation result is positive, the opening change amount indicates that the throttle valve opening is increased, when the calculation result is negative, the throttle valve opening is closed, and when the calculation result is zero, the throttle valve opening is kept unchanged, wherein delta T" is the actual superheat degree of heating, delta T "= suction temperature T s Fin temperature T def Delta T is the target superheat degree of heating.
Preferably, the initial value of DeltaT is DeltaT', and the machine unit is started up to be full T 2 After this, deltaT is first corrected according to the following table, where T 2 ＞t 1 ：
Preferably, Δt' is a constant set by the system.
Preferably, the machine is on-machineFull t of assembly machine 3 After that, for pass DeltaT d And DeltaT d "comparison, a second correction is performed on DeltaT, deltaT d For target superheat degree of exhaust, deltaT d "is the actual degree of superheat of the exhaust gas, deltaT d ”＝T d -T pd ，T d T is the actual exhaust temperature pd The exhaust saturation temperature is specifically as follows:
when DeltaT d ”-△T d When the delta T is not less than a, subtracting 2 after the first correction;
when b is less than or equal to delta T d ”-△T d When the delta T is less than a, subtracting 1 after the first correction;
when c is less than or equal to delta T d ”-△T d When < b, deltaT is not corrected for the second time;
when d is less than or equal to delta T d ”-△T d When < c, adding 1 after the delta T is corrected for the first time;
when DeltaT d ”-△T d When the delta T is less than d, adding 2 after the first correction;
wherein a > b > c > d.
Preferably, the period of the second correction is T.
Preferably, the DeltaT d The values are according to the following table, deltaT d The exhaust temperature of the compressor is always ensured to be in a proper range value by controlling the superheat degree of the exhaust through a large amount of experimental data, and the stable operation of the unit is ensured:
preferably, the initial opening of the throttle valve when the unit is started is shown in the following table, wherein the initial opening of the throttle valve is set according to the outdoor load, and when the ring temperature is high, the heat absorption capacity of the fin heat exchanger is large, the circulating refrigerant amount of the system is also large, and the opening of the initial valve is large; when the ring temperature is low, the heat absorption capacity of the fin heat exchanger is small, the circulating refrigerant quantity of the system is also small, the opening degree of the initial valve is small, and the circulating refrigerant quantity can be ensured to be in a proper range:
| ambient temperature T ao | [-∞,-20) | [-20,-10) | [-10,0) | [0,15) | [15,25) | [25,+∞) |
| Throttle valve initial opening | 150 | 200 | 260 | 320 | 400 | 450 |
Preferably, t is 1 2min, t 2 5min, t 3 For 10min, the value range of DeltaT' is [ -5,5]The period T of the second correction is 10s, wherein a is 10, b is 5, c is 0, d is-5.
The invention adopts a target superheat degree control mode for the throttle valve, and then corrects the throttle valve by using the exhaust superheat degree, so that the problem of out-of-control adjustment of the throttle valve is avoided, the exhaust temperature is always kept within a reasonable range value, the unit can be ensured to stably operate at different water temperatures and different ring temperatures, and the operation life of the unit is prolonged.
Drawings
Fig. 1 is a schematic structural view of a low temperature heat pump EVI water heater.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Furthermore, in the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The invention will now be described in further detail with reference to the accompanying drawings by means of specific examples.
As shown in fig. 1, the structure of the low-temperature heat pump EVI water heater is illustrated, the low-temperature heat pump EVI water heater comprises a compressor 1, a four-way valve 4, a waterway heat exchanger 2, a fin heat exchanger 3, an economizer 5, a throttle valve 6, an electromagnetic valve 7 and an air supplementing capillary tube 8, wherein an exhaust port of the compressor 1 is provided with a first temperature detection device 10 and a pressure sensor 9, and the first temperature detection device 10 is used for detecting the exhaust temperature T of the compressor 1 d The pressure sensor 9 is used for detecting the discharge pressure of the compressor 1 and converting the discharge pressure into a discharge saturation temperature T pd A second temperature detection device 11 is arranged on the air suction pipe between the compressor 1 and the four-way valve 4 and is close to the compressor 1 for detecting the suction temperature Ts of the compressor 1, a third temperature detection device 12 is arranged at the inlet of the lower part of the fin heat exchanger 3 for detecting finsTemperature T def A fourth temperature detecting device 13 is arranged at the upper part of the fin heat exchanger 3 and is used for detecting the ambient temperature T ao A fifth temperature detecting device 14 is arranged at the water inlet pipe of the waterway heat exchanger 2 and is used for detecting the water inlet temperature T in The electromagnetic valve 7, the air supplementing capillary tube 8 and the economizer 5 form an air supplementing device, the refrigerant condensed from the waterway heat exchanger 2 is throttled by the air supplementing capillary tube 8 and then absorbs heat in the economizer 5 to become gaseous refrigerant to the air supplementing port of the compressor 1, the electromagnetic valve 7 is a one-way electromagnetic valve, the refrigerant can only enter from a horizontal pipe of the electromagnetic valve 7 in the figure and cannot enter from the opposite direction, the throttle valve 6 is an electronic expansion valve, the flow of the circulating refrigerant is controlled, and the adjusting range is 0-500 PLS.
Aiming at the low-temperature heat pump EVI water heater shown in the figure 1 and the low-temperature heat pump EVI water heater with other structures, the invention provides a throttle valve control method of the low-temperature heat pump EVI water heater, after a unit is started, a throttle valve is opened according to an initial opening degree and maintains the duration of the initial opening degree for 2min, and then the throttle valve is controlled to adjust the air suction superheat degree;
the suction superheat degree is adjusted as follows: opening change amount= delta T "- [ delta ] T, and rounding the calculation result, wherein when the calculation result is positive, the opening change amount indicates that the throttle valve opening is increased, when the calculation result is negative, the throttle valve opening is closed, and when the calculation result is zero, the throttle valve opening is kept unchanged, wherein delta T" is the actual superheat degree of heating, delta T "= suction temperature T s Fin temperature T def Delta T is the target superheat degree of heating, the initial value of Delta T is Delta T ', and the value range of Delta T' is [ -5,5]Preferably 0, after the unit is started up for 5min, Δt is corrected for the first time according to the following table:
after the machine set is started up for 10min, the machine set passes delta T d And DeltaT d "comparison, the second correction of DeltaT is performed according to a period T, T is 10s, deltaT d For target superheat degree of exhaust, deltaT d "is the actual degree of superheat of the exhaust gas, deltaT d ”＝T d -T pd ，T d T is the actual exhaust temperature pd The exhaust saturation temperature is specifically as follows:
when DeltaT d ”-△T d When the delta T is more than or equal to 10, subtracting 2 after the first correction;
when delta T is less than or equal to 5% d ”-△T d When the delta T is less than 10, subtracting 1 after the first correction;
when 0 is less than or equal to delta T d ”-△T d When < 5, deltaT is not corrected for the second time;
when-5 is less than or equal to delta T d ”-△T d When the delta T is less than 0, 1 is added after the first correction;
when DeltaT d ”-△T d When the value is less than-5, adding 2 after the delta T is corrected for the first time;
said DeltaT d The values are according to the following table, deltaT d The exhaust temperature of the compressor is always ensured to be in a proper range value by controlling the superheat degree of the exhaust through a large amount of experimental data, and the stable operation of the unit is ensured:
the initial opening of the throttle valve when the unit is started is shown in the following table, wherein the initial opening of the throttle valve is formulated according to the outdoor load, and when the ring temperature is high, the heat absorption capacity of the fin heat exchanger is large, the circulating refrigerant quantity of the system is also large, and the opening of the initial valve is large; when the ring temperature is low, the heat absorption capacity of the fin heat exchanger is small, the circulating refrigerant quantity of the system is also small, the opening degree of the initial valve is small, and the circulating refrigerant quantity can be ensured to be in a proper range:
| ambient temperature T ao | [-∞,-20) | [-20,-10) | [-10,0) | [0,15) | [15,25) | [25,+∞) |
| Throttle valve initial opening | 150 | 200 | 260 | 320 | 400 | 450 |
Finally, it should be noted that the above list is only specific embodiments of the present invention. Obviously, the invention is not limited to the above embodiments, but many variations are possible. All modifications directly derived or suggested to one skilled in the art from the present disclosure should be considered as being within the scope of the present invention.
Claims (8)
1. A throttle valve control method of a low-temperature heat pump EVI water heater is characterized in that after a unit is started, a throttle valve is opened according to an initial opening degree and maintains the duration t of the initial opening degree 1 Then controlling a throttle valve to adjust the superheat degree of the air suction;
the suction superheat degree is adjusted as follows: opening variation= Δt "-" Δt,and rounding the calculation result, when the calculation result is positive, the throttle opening is increased, when the calculation result is negative, the throttle opening is reduced, and when the calculation result is zero, the throttle opening is kept unchanged, wherein DeltaT 'is the actual superheat degree of heating, deltaT' = suction temperature T s Fin temperature T def Delta T is the target superheat degree of heating.
2. The control method of a throttle valve of a low temperature heat pump EVI water heater according to claim 1, wherein the initial value of Δt is Δt', and the unit is started up to be full T 2 After this, deltaT is first corrected according to the following table, where T 2 ＞t 1 ：
3. The method of claim 2, wherein Δt' is a constant set by the system.
4. The control method of a throttle valve of a low temperature heat pump EVI water heater according to claim 2, wherein the valve is fully opened at unit start-up time t 3 After that, for pass DeltaT d And DeltaT d "comparison, a second correction is performed on DeltaT, deltaT d For target superheat degree of exhaust, deltaT d "is the actual degree of superheat of the exhaust gas, deltaT d ”＝T d -T pd ，T d T is the actual exhaust temperature pd The exhaust saturation temperature is specifically as follows:
when DeltaT d ”-△T d When the delta T is not less than a, subtracting 2 after the first correction;
when b is less than or equal to delta T d ”-△T d When the delta T is less than a, subtracting 1 after the first correction;
when c is less than or equal to delta T d ”-△T d When < b, deltaT is not corrected for the second time;
when d is less than or equal to delta T d ”-△T d When < c, adding 1 after the delta T is corrected for the first time;
when DeltaT d ”-△T d When the delta T is less than d, adding 2 after the first correction;
wherein a > b > c > d.
5. The method of claim 4, wherein the second correction period is T.
6. The method of claim 5, wherein the Δt is a throttle valve of the EVI water heater d Values were taken according to the following table:
7. the control method of a throttle valve of a low temperature heat pump EVI water heater according to claim 6, wherein the initial opening of the throttle valve when the unit is started is as follows:
8. The method for controlling a throttle valve of a low-temperature heat pump EVI water heater according to claim 7, wherein t is 1 2min, t 2 5min, t 3 For 10min, the value range of DeltaT' is [ -5,5]The period T of the second correction is 10s, wherein a is 10, b is 5, c is 0, d is-5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311798592.1A CN117824164A (en) | 2023-12-25 | 2023-12-25 | Throttle valve control method of low-temperature heat pump EVI water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311798592.1A CN117824164A (en) | 2023-12-25 | 2023-12-25 | Throttle valve control method of low-temperature heat pump EVI water heater |
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| CN117824164A true CN117824164A (en) | 2024-04-05 |
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| CN202311798592.1A Pending CN117824164A (en) | 2023-12-25 | 2023-12-25 | Throttle valve control method of low-temperature heat pump EVI water heater |
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